<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Ajax获取文件内容</title>
    <script>

        var xmlhttp = new XMLHttpRequest();
        xmlhttp.onreadystatechange = function() {
            if (this.readyState == 4 && this.status == 200) {
                myObj = JSON.parse(this.responseText);
                document.getElementById("demo").innerHTML = myObj.name;
            }
        };
        xmlhttp.open("GET", "json_demo", true);
        xmlhttp.send();

    </script>
</head>
<body>
<p id="demo"></p>

</body>
</html>